I'd like to say that I am +1 with everything that has been said against
breakage.
On top of that, I'd like to echo the conversation I had with Fabian
Pedregosa, who works in my group full time on scikit learn.
Fabian was doing binaries. I asked him what numpy version he had used to
build to the binaries. He replied 1.4, so I told him that his package
would not work in the lab, and he looked at me unbelieving.
Gaël